单项选择题
A.While B.When C.As D.If
A.It is useless to complain. B.It is useless complaining. C.Complaining is useless. D.It is useless of complaining.
A.for B.on C.of D.about
A.a many difference B.much difference C.many difference D.much a difference
A.essays B.files C.documents D.records
A.tune B.tunes C.the tune D.a tune
A.as result B.as a result of C.as the result of D.a result of
A.great advancesin B.a great advancein C.great advanceon D.a great advanceon
A.tell B.to tell C.telling D.to telling
A.were questioned B.who questioned C.who were questioned D.question
A.expand B.which expand C.which expanding D.to expand